Microbial Tracking-2, a metagenomics analysis of bacteria and fungi onboard the International Space Station.

This may be significant in the context of a recent study comparing “unrestricted” built environments (public houses, public buildings, private houses) with “confined” built environments (intensive care units (ICU), cleanrooms, cleanroom gowning areas) where it was shown that each of the three “confined” environments had a considerably higher representation of amino acid utilization compared to carbohydrate utilization, with the opposite being true for the “unrestricted” environments (higher carbohydrate utilization compared to amino acids) [ 50 ].

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